Arthur l



A. L. EDWARDS.

DRILLING MACHINE.

APPLICATION FILED JULY 25,1921.

1,424,997. Patented Aug. 8, 1922.; I

2 SHEETS-SHEET x'.

Ill M l/I/I/E/I/TOR AlL.Edwwrd.s,.

ATTORNEYS SHEET 2.

l1 TTOR/UEYS A. L. EDWARDS.

DRILLING MACHINE.

APPLICATION FILED JULY 25,1921.

Patented Aug. 8, 1922.

2 SHEETS ARTHUR L. EDWARDS, OF MAUPIN, OREGON.

. DRILLING MACHI NE.

Application filed July 25, 1921. Serial No. 487,257.

To all whom it may concern. v r Be it known that I, ARTHUR L. EDWARDS, a citizen of the United States, and resident of Maupin, in the county of'Wasco and State of Oregon, have invented certain new and useful Improvements in Drilling Machines, of which the following is a specification.

This invention relates to improvements in drilling machines and more particularly to the power transmitting means therefor.

Briefly stated, an important object of this invention is to provide a pitman rod or power transmitting mechanism for a drilling machine having novel means to relieve the machine. of excessive destructive strain due to the sticking of the drilling mechanism in the hole.

A further object is to provide a pitman rod v which by reason of its strain relieving qualirod for. drilling machines which may be etficiently applied to variousitypes and styles of drilling machines and which is comparatively cheap to manufacture.

Other objects and advantages of the in-,

vention will be apparent during the course of the following description.

In the accompanying, drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figurel is a side elevation of the improved pitmanrod applied to a drilling machine of the walking beam type. v Figure'2 is a side elevation of the improved pitman rod applied to aslightly different typeof drilling machine,

Fgure 3 is aside elevation of the improved pitman rod in its inoperative position.

' Figure 4' is a central vertical longitudinal sectional view through the improved pitman rod in its inoperative position. 3

Figure 5-is a central verticallongitudinal sectional view through the improved pitman rod in its extended ,or operative position.

Figure 6 is a horizontal seetional view taken online 6-6 of Figure 4;.

Figure 7 is a perspective of a yoke em- I bodied the invention.

Figure 8 is a perspective of a sleeve embodied in the invention.

Figure 9 is a fragmentary perspective of the locking arm embodied in the invention.

In the drawings wherein for the: purpose of illustration is shown a preferred embodiment of the invention, 10 designates a power wheel drivenby any suitable means and havmg a crank 11' to which the improved pitman rod 12 is pivotally connected As illustrated in Figure l, the upper portion of. the

pitman rod which forms the subject matter of this application is connected to a walkmg beam 13 many desired or well known manner.

. The pit-man rod 12 may be connected to a a variety of types of machines and by way of illustration the same has been shown in Figure 2 as applied to a drilling machine having cranks 15 and 16 employedflas' a means for transmitting power to the drilling a mechanism.

The improved pitman rod or power transmitting device generally designated bythe numeral 12 is particularly designed to relieve the drilling mechanism of the severe strains encountered when the drilling mechanism is suddenly stoppedythrough striking an obstruction. v

Specifically, the improved pitman rod comprises a tubular body 20 which slidably and freely receives a plunger 21. As illustrated in Figure 4 a sleeve nut 22 is threaded into the lower end of the tubular body 20 and'i'orms an abutment for a retractile coiled spring 23. The coiled spring 23 which surrounds the'plunger21 engages an annular shoulder 24 formed at the lower end of the sleeve 26. The sleeve 26 which is slidable on the plunger'has its upper portion reduced in its external diameter to define an annular shoulder 27 which contacts with a, second retractile coiled spring28. The second retractile coiled spring 28 is also arranged on the plunger 21 and is confined between the sleeve 26 and an annular enlargement or shoulder30 formed adjacent the upper end of the plunger.

The plunger is formed beyond the integral shoulder 30 with a threaded shank 31 to.

adjusting the nuts 36 the yoke 32 may be adjusted longitudinally of the plunger for apur oseto be fully hereinafter described.

The means for holding the'plunger in a set position with relation to the tubular body under normal conditions includes a pair of oppositely arranged'arms {l0 pivot-' ally connected at their upper ends to the pairs of laterally "projecting apertured ears 4'1 bymeans of pivot pinsAQ. The lower terminal portions of the armsilO are formed inwardly directed fingers 4ft curved transversely and received within an annular groove e5 formed in the intermediate portion of the" sleeve"26. when the inwardly :dire'cted'fingers l' l are yield ablyheldin the annular groove forrecess lfijfthe sleeve is 'det achably held in a'set po'sitionwith the result that the plunger 21 is held in a set position with relation to the tubular body. When thetransversely curved) fingers 44: are received within the annular recess 45 the ends of the lingers contact with the annular shbulder constituting theside walls of the annular recessso that the endwise movement of the sleeve is prevented. In order to move theplunger 21 for a substantial distance withlrelation to the tubular body it is necessary to ;move the arms 40 outwardly against the pressure of a pair of coiled springs lti which'are secured to the hooked terminal portions of laterally projecting ex} tensions 47 'formedfadjacent theforward ends o f the arms 40.

l The: rms to may r m v be moved outwardly'to the position illustrated in Figure 5 loy noving the y n; v32 longitudinally and thereby forcing-the(beveledends 429 of the same between the forward. portions of the arms and sides of the sleeve 26. n 'l Vhen an excessive longitudinal strain on the pitmanrod is encountered a pull down- 7 wardly'is enerted on-the'p'lunger 21- which results in the'retractile coiled spring being compressed to a'limited extent so asto move e'veled 'e'nds 49 betwee n the sleeve 26 thearms 35 of the yoke thus ees between the sleeve" and the curved P ti nsfwfot theflarms 41-9, the finger'sea are r easecl tron engagement with the nular a released from the an-- 7i en the 'j'pit'inan rod is coihspiing' 23 whereby of the connecting portion of the yoke. By

operation.

ansversely curvedfinner: sides 50 of I I j H l r -said sleeve. andfonecend ofsaidjbody, said shoi'ilders' "constituting the "'walls of the an:

.23 returns the sleeve to its original position on the plunger so that the fingers a l may re-enter the annular recess 45. 'Therefore,v,whenthe strain is relieved, the pitman rod automatically returns to its operative position for the resumption of the drilling The yoke 32 maybe positioned :with its end 619 close to the inwardly directed terminal portions o f'the arms 40 so as to cause the arms 40 to spread as soon as thestrain becomes slightly excessive. on the other handthe yoke 32 maybe positioned adjacent the rear end of the threaded shank 31 so that theplunger will have to move quite a distance before the beveled ends 49 are wedged between the inwardly directed portions olijthe arms lO When the yoke32 is thus positioned the spring 28 is permitted to partially contract before the arms a0 are spread Thisadjustment of the pitman rod renderstlie same less sensitive to strains. A Cushi ni g s i tig eni sp g 5 i niounted on the; plunger adjacent the nut 22 and (adjusted by means ofnuts 56f threadedgfln' the lower terminal portion ofthe plunger 21 z I I Byway of illustration l'have"shown the terminal portion ol the plunger-21 equipped with a :U-shaped attaching member.58, wliicl1' may-be attached to a link. 60 or the like which is" in ti rn connected tothe crank of the .drilling' machine; However, the improved pitman rodniayhe connected to the drilling inachinein a variety or ways as is obvieus. The tubular body maybe connected to the machine by means o fthe extension 62 having apertur s .63hfor' the receptionof fastening devices. r i

' IWith reference to the foregoing idescription taken iin connection with the accompanying drawings, it will be apparent that apitinan rod constructed in accordance with this invention 1 will relieve, the drilling mechanism of excessive strain and will resurne its normal positionwhenthe strain 2. A. pitman rod comprising a body, 130

7 ing arms carried thereby and having fingers, a plunger in said body, a sleeve slidable on said plunger, a spring confined between said sleeve and one end of said plunger, a second spring confined between said sleeve and one end of said body, said sleeveprovided with means engaging the fingers of said locking arms whereby to hold the sleeve in a set position, and means urging the arms into looking engagement with said sleeve.

3. A pitman rod comprising a body, locking arms carried thereby and having fingers, a plunger in said body, a sleeve slidable on said plunger, a spring confined between said sleeve and one end of said plunger, a second spring confined between said sleeve and one end of said body, said sleeve provided with means engaging the fingers of said locking arms whereby to hold the sleeve in a set position, and coiled springs arranged on o'p posite sides of said body and connected to said arms for urging the same into locking engagement with said sleeve.

4. A pitman comprising a body, a plunger extending into the body, a sleeve slidable on said plunger, a coiled spring confined between said sleeve and the upper portion of said plunger, locking means engaging said sleeve to detachably hold the same in position, and a yoke secured on said plunger for releasing said. locking means.

5. A pitman comprisinga body, a plunger extending into the body, a sleeve slidable on said plunger, a spring confined between said sleeve and the upper portion of said plunger, locking means engaging said sleeve to detachably hold the same in position, a yoke secured on said plunger for releasing said locking means, and a second spring confined between said sleeve and one end of said body.

6. A pitman comprising a body, a plunger extending into the body, a sleeve on said plunger, a spring confined between said sleeve and the upper portion ofsaid plunger, locking means engaging said sleeve, a yoke secured. on said plunger for releasing said locking means, a second spring confined between said sleeve and one end of said body, and a cushioning spring mounted on said plunger.

7. A pitman extending into the body, a sleeve slidable on said plunger, a coiled spring confined between said sleeve and the upper portion of said plunger, locking means engaging said sleeve to detachably hold the samein an adjusted position, a yoke secured on said plunger for releasing said locking means, a second spring confined between said sleeve and one end of said body, and a cushioning spring mounted on said plunger adjacent one end of said body, said yoke being adjustable on said plunger.

8. A pitman comprising a tubular body,

comprising a body, a plunger.

a, plunger extending into the tubular body and having a shoulder adjacent one end, a.

sleeve slidable on said plunger and having an annular recess, locking arms pivotally connected to said body and having fingers adapted to be received within said annular recess, a U-shaped yoke secured on-said plunger and having arms arranged between said first named arms and said sleeve, the terminal portions of said second named arms being beveled and adaptedv to separate said arms and said sleeves, and a coiled spring confined between said shoulder and the sleeves.

9. A pitman comprising a tubular body, a plunger extending into the tubular body and having a shoulder, a sleeve slidable on said plunger and having an annular recess, locking arms pivotally connected to said body and having fingers adapted to be received within said annular recess, a U- shaped yoke secured on said plunger and having arms arranged between said first named arms and said sleeve, the terminal portions of said second named arms being beveled and adapted to separate said arms and said sleeves, and a spring confined between said sleeve and one end of said body.-

10. A pitman comprising a tubular body, a plunger extending into the tubular body and having a shoulder adjacent one end, a sleeve slidable on said plunger and having a recess, locking arms pivotally connected to said body and having inwardly directed fingers adapted to be received within said recess, a U-shaped yoke secured on said plunger and having arms arranged between said first named arms and said sleeve, the terminal portions of said second named arms being beveled and adapted to separate said arms and said sleeves, a spring confined between said sleeve and one end of said body, and means urging said arm into locking engagement with'said sleeve.

11. A pitman rod comprising a body, a plunger associated with said body, a looking arm carried by said body, and a yoke carried by said plunger and adapted for releasing said locking arm.

12. A pitman rod comprising a body, a plunger associated with said body, a locking arm carried by said body, a yoke carried by said plunger and adapted for releasing said locking arm,

and means yield ably urging said locking arm to an operais M 4997 opposite sides of saidsleeve.

A pitman rod consisting of a pairof sections, a sleeveslidable on one of the sec- "tion's; a locking arm carried by the othersection and adapted for engaging said 10 sleeve, and a yoke carried by one of said sections and having means for releasing said arm from engagement with said sleeve.

' ARTHURv L. EDWARDS. 

